• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Generation Iron

Generation Iron Fitness & Strength Sports Network

  • Movies
  • Original Content
  • Reviews
    • Supplements
      • Pre-Workout
      • Fat Burners
      • Testosterone Boosters
      • Creatine
      • Protein
      • BCAAs
      • Multivitamins
      • Omega-3
      • Joint Supplements
      • Super Greens
      • Meal Replacement
    • Recovery
      • Best Cold Plunges
      • Best Saunas
      • Best Foam Rollers
      • Best Massage Guns
    • Programs
      • Best Online Workout Programs
      • Best Workout Streaming Services
      • Best Home Workout Programs
  • Equipment
    • Cardio
      • Treadmills
      • Best Exercise Bikes
      • Best Stair Climbers
    • Fitness Accessories
      • Best Apparel
      • Best Gym Bags
      • Weightlifting Shoes
    • Strength
      • Best Dumbbells
      • Best Barbells
      • Best Kettlebells
      • Best Squat Racks
      • Best Weightlifting Belts
      • Best Home Gym Equipment
      • Complete Home Gyms
    • Training
      • Best Knee Sleeves
      • Best Wrist Wraps
      • Best Weightlifting Wraps
      • Best Weightlifting Gloves
  • More
    • About Us
      • Our Team
      • Our Experts
    • Advertise
    • Franchise With Us
    • Exercise Guides
    • Athlete Profiles
    • Podcasts
    • Power 30
    • Bodybuilding Awards
    • Supplement Awards
  • Shop
News

Brazilian Brothers Risk Health With Potenay B12 Synthol Injections

by Nicholas Bell Published on Feb 12, 2018

This post may contain affiliate links (disclosure policy).

Risking it all for “gains”.

Two Brazilian brothers with biceps measuring more than 25 inches have revealed the secret to their “incredible size”: regular chemical injections.

Tony ‘Hulk’ Geraldo , 49, and Alvaro ‘Conan’ Pereira, 50, are two bodybuilders from Rio de Janeriro, Brazil. They claim there was a time when they were ‘addicted to getting big’ but now believe they have it under control. Their eye – catching physiques were achieved thanks to a product called Pontenay B-12, which Pereira says he has been injecting since age 15.


Geraldo began injecting at age 18. Both said they felt that they were too skinny. During treatment, the brothers inject the chemical in cycles – two times a week with five days in between.

Pereira told DailyMail, “Back then we were [addicted.] Today, no. I have it under control. People around me didn’t let me go on the wrong path and I did the same with my brother. He always wants to be bigger, but I always tell him that we need to be careful.”

Now, Geraldo’s biceps measure 28 his brothers are not far behind at 25-inches. The brothers also work out together for hours every day and adhere to a relatively strict diet. Both try to reach 4,000 to 6,000 calories a day of whole foods. Their favorite pre-workou meal is 12 bananas and six egg whites.


Pereira met his wife at the gym. he says she hand his seven children support him in his pursuit of size. Geraldo has been married for 27 years and says his wife is extremely opposed to his injections. Geraldo said he has told his wife she can deal with it or leave him:

“My wife doesn’t like it. However, I am happy with myself. She has to accept me like I am, or we will have to go on separate ways. I usually tell my wife that she’s the only one who doesn’t like me. Other women love my size, they love it.


“Once we were walking in front of my gym and I told her, ‘Look, if you don’t want me there are several other girls who does.’ Then, pointed to all the girls coming to talk to me.”

Whether or not that last bit is true or simply in his head, the idea that injecting synthol should be treated as some kind of achievement is simply a slap in the face to the bodybuilders who put countless hours of work in the gym. It appears this synthol is going to get worse before it gets better.

For more news and updates, follow Generation Iron on Facebook, Twitter, and Instagram.

About Nicholas Bell

View All Articles

Primary Sidebar

Get the Latest

Stay informed with the latest news, product reviews, & expert advice.

Popular Reviews

  • best protein powders

    The Best Protein Powder Supplements of 2025 (Tried and Tested)

  • Best Creatine Supplements For Bulking & Muscle Growth of 2025 (Personally Tested)

  • top x pre workout

    The 14 Best Pre-Workout Supplements of 2025 (MD Reviewed)

  • Performance Lab SPORT BCAA

    The Best BCAA For Bodybuilding Health & Performance Goals

Trending Articles

  • female fitness models

    18 Best Butts On The Internet (Updated 2024)

  • ronnie coleman the king workout

    Ronnie “The King” Coleman’s Complete Bodybuilding Workout

  • Chris bumstead's 2024 workout and diet plan

    Chris Bumstead’s 2025 Complete Bodybuilding Workout & Diet Plan

  • The Ultimate Mike Mentzer Workout and Diet

Popular Now

  • best protein powders

    The Best Protein Powder Supplements of 2025 (Tried and Tested)

  • Best Creatine Supplements For Bulking & Muscle Growth of 2025 (Personally Tested)

  • top x pre workout

    The 14 Best Pre-Workout Supplements of 2025 (MD Reviewed)

  • female fitness models

    18 Best Butts On The Internet (Updated 2024)

  • best citrulline supplements

    The Best Citrulline Malate Supplements for Performance and Pump

  • ronnie coleman the king workout

    Ronnie “The King” Coleman’s Complete Bodybuilding Workout

Generation Iron

Generation Iron is the first and only digital network delivering health, fitness, bodybuilding, and strength sports content. We deliver premium content with the biggest names in fitness and provide expert coverage, reviews on top brands, workout tips and trends in the worlds of fitness, health and strength sports.

Strongman Corporation
Vladar

Sections

  • Trending News
  • Original Movies
  • Original Content
  • Supplement Reviews
  • Equipment Reviews
  • Exercise Guides
  • Nutrition Guides
  • Athlete Profiles

More

  • About Us
  • Our Team
  • Our Experts
  • Advertise
  • Franchise With Us
  • Podcasts
  • Power 30
  • Shop

CONTACT

Generation Iron Brands LLC
134 West 29th Street Suite 902
New York, NY 10001
Email: [email protected]

Follow

  • Facebook
  • Instagram
  • X / Twitter
  • YouTube

© 2025 · Generation Iron · Disclaimers · Privacy Policy · Accessibility